Vehicle-brake.



H. B. LESTER. VEHICLE BRAKE. APPLICATION FILED AUG. 2. 1910.

989,617, v APatented Apr. 18,1911.

2 SHEETS-SHEET 2.

UNITED 'STATES PATENT oEEIcE.

HARRY B. LESTER, F DAYTON, OHIO, ASSIGNOB. TO THE DAVIS SEWINGIIACHINE COMPANY, 0F DAYTON, OHIO, A CORPORATION Ol' Omo.

VEHICLE-BRAKE.

Speelcation of Letters Patent.

Patented A'pr. 18 y1911.

Application tiled August 2, 1910. Serial No. 575,152.

To-all whom it may concern.' y

Beit known that I, HARRY BURDETT Las- Tnn, a citizen of the United States, residing at Dayton, in thecounty of -Montgomer and State of Ohio, have invented a new an usea relatively fixed clutch part inV such manner as to cause that part to become engaged l -withthe driven member and retard or stop its rotation.

The object of theinvention isto reduce a brake of this character which, wh' e small in diameter and adaptable lto vehicles of variousftypes, and having-balls of lai` e size running in races that are of considera le dil ameter and are widely'separated in order-to gravide a strong, firm and durable bearing, asavery'quick acting, powerful and durav4ble braking clutch which is so actuated -that no4vstrain orpressure is brought uponV the bearings when it'is set for braking.

` This invention is illustrated herein asex'n# bodied-ina brake for bicycles. The brake shown has a driving clutch lart in the forni of a sleeve whichl 1s' threaded upon end has a im'ited longitudinal movement along Aa part ofthe drivin memberwhich 1n this case is the 'sprocket ub. ,When the sprocket hub Is turned one direction, the

ed with a.4

tapering end of the'sleeve-is'en' ta inner wall of lthe'drxven part or w eell ub, and when the sprocket hub is turned in the opposite direction, the dri tinued rotary 'movement .of the clutch sleeve clutch or drum to be'- expanded into -ent with a ylindrical inner wall o hub 4for-braking purposes.'

"expand the brake clutch art to be disengaged' from the driven mem er and connected with ,in reverse directioncauses a fixed cylill- Figure 1 of the accompanying drawin s shows a central longitudinal section of te hub and brake parts. Fig. 2 is a transverse section on the plane indicated by the dotted line 2 2A on Fig. 1. Fig. 3 is a side view of the fixed axle and one of thestationary ball cones. Fig. 4 is an end view of the axle` and cone. Fig..5 shows a centralsection and the two ends of a preferred form of brake clutch drum. Fig. 6. shows a side and an end view of one of the wed es employed to rum shown in Fig. 5. Fig. 7 shows a central section and the two ends 'of the collar that is engaged bythe driving clutch sleeve on its inward movement, and thecam shaft attached to said collar which is u sed to force the ex anding wedges intov the brake drum. ig. 8-

shows a face and a section of the interiorly threaded driving clutch sleeve. Fig. 9 is asection ofthe drag bushing. Fig. 10 is a section of the Asto;` nut which is employed to limit the longitu al movement of the driving clutch sleeve. F'

the exteriorly threade srocket hub or dring member. Fig. 12 s of the axle ball cones. Fig. 13 is a section o f the .drivin spfocket'lock mit. Fig. 14 shows a longitu inal section of the wheel hub or driven member. Fi l'shows apersgective view of an adjustab e cone retainer. ig. 41 6 shows a .side view of the end of a .frame rovided with one of these cone retainers. i'g.

. 17 shows an endend side view of a -l'nodiied form of brake clutch'.

The wheel hub 1`ma .have any desired outline. In each end o the wheel hub is a' 11 shows a view' ofows a view ofc'eo raceoontainingjballs 2 of considerable size. 'n

The 'ballsjat one end are lheld in the race by 'a cone 'which 'is lscrewed' upon the threaded end of theaxle 4 and is held against rotation after it has'been d usted by the gementV of the common attened hub 5 wig frame, or by any other desire means. The balls at the otherend of the wheel hub-are' the walls of the'o nin'gin'tlw' held in the race by the cone on thejfsprocket hub 6,. which turns) freely on the: axle. Screwed, 'otherwise upon 'the outer end of the'spmcket'hubris the driving sprocket 7, which inthe oilgxmsatr 5P e' is held in place-b the nut 8, .In ou .fend of thejsproeketvhub a containing balls are held binds against the parts with which it is v to ex and the brakedrum against the cylin- I colla-r, 'the only pressurebeing that rotary mortise27 which fits the flattened extensionA in place by the cone 10, that when set is held I against rotation by the engagement of its iattened outer e'nd with the frame or other l device. i

The drivin member or sprocket hub on l its exterior as coarse threads 11. The driving clutch sleeve 12 has corresponding coarse threads 13 in its interior, which fit the threads on the exterior of the sprocket hub. At one end the exterior of this clutch sleeve has a conical surface 14 which is adapted to engage the tapering inner wall 15 of the wheel hub. The threads are so pitched that when the sprocket hub is turned forward, the clutch sleeveis caused to en-A gage with the wheel hub and drive it forward with the driving member. When the sprocket hub is turned backward, tlie threads move the driving clutch sleeve longitudinally and cause it to disengage from the wheel hub. Screwed on the threaded inner end of the sprocket hub is a stop nut 16 which is designed to limit the inward vmovement of the driving clutch sleeve, and connected with the clutch sleeve is a dra bushing 17. This bushing is slitted so that 1t frictionally engaged, in order to insure the proper action of the clutch sleeve.

The inner end of the driving clutch sleeve has ratchetteeth 18. .Adjacent and opposite to these are ratchet teeth 19 on the collar 20. Extending from this collar is a tubular shaft 21 which has portions of its sides 22 flattened to provide camming surfaces. Surrounding this cam shaft is the cylindrical' brake drum 23 which has mortises 24 extending longitudinally for a partV of its length on opposite sides, and transverse grooves 25 for the urpose of rendering .the drum expansible. iin-the longitudinal mortises ofthe brake drum are Wedges 26. These rest against the flattened or cam surfaces of the cam shaft which is,connected with the -ratchet-toothed collar. When the sprocket hub is turned backward, the driving clutch sleeve is moved inward. After it has movedinward a sufficient distance, its teeth engage the teeth ,of -the collar and turn Vitso as to partially rotate the cam Shaft connected therewith the cam surfaces of which, lwhen turned, orceout the diametrically opposite wedges andcause them dric`a` inner wall of the wheel hub for brak-4 ing pur oses. The inward movement ofi the clutch eeve, as above stated, is limited by the Astop nut yon the end ofthe sprocket hub. Consequently, ther-eis no 1o tudinal thrust between the 'clutch'sleeve an the cam shaft pressure which is incident to the eng ement of, the flat surfaces of the lteeth d? these two parts. 'Eheend of the brake drum has a 28 on the inner side of the stationary cone 3, for preventing the rotation of the brake drum.

The brake drum may be slitted spirally as shown in Fig. 17. In this case, the toothed |,co1lar' 29, which is engaged by the toothed driving clutch sleeve ma be connected di rectly .with the spiral b y 30. This spiral body has a transverse mortise 31, at one end which is adapted to engage the flattened part 28 of the cone 3, for holdin the clutch drum against rotation. In this orm, when the driving clutch sleeve has been moved longitudinally inward by the reverse rotation of the sprocket hub, and its teeth engage the teeth of the collar, the untwisting of the spiral causes the drum to expand a ainst the cylindrical inner wall of the whee hub.

For the urpose of preventing the rotation of the stationary ball cones on the spindles, I have provided an adjustable cone retainer which is adapted to be connected with various forks. One of these retainers is shown in Fig. 15. In the body 32 of this retainer is an opening 33 which is adapted to receive the flattened outer end of the cone. Lugs 34 are turned up from the edges of the plate, and extending through threaded openings in these lugs are screws 35 which are adapted to be set against theV ends of the fork v36, and to be fastened against movement by the clamp nuts 37. The retainer plate has at 'the opposite end lugs 38 which are designed to engage the edges of the fork end each side ofthe lugr39 which carries the axle adjusting screw 40.

4than-,when thedriving member is turned forwardly the clutch sleeve is moved'longitudinally outward and" caused to' engage with the inner wall of the driven member for the purpose of it forward, .and

when the driving member -is turned back? wardly the clutch sleevelis moved longitudinally inward so its teeth 'will engagewith the teeth of the brake drum expanding means, and by positive rotatory pressure against said expanding means cause .the

expansion of the drum-against the inner wall of the dri-ven member forY brakijngthe 2. Thecombination'ofa driven member, a-

threaded driving member, ,a threaded clutch sleeve fitting and movable longitudinally alon the driving member, means mounted on t e threaded driving member for limiting the inward longitudinal movement of the clutch sleeve a non-rotating brake drum located within the driven'me-mber, and rotatory means for expanding said brake drum against the inner surface of the driven member, the threaded connection between the driving member and the clutch sleeve being such that, when the `driving member is turned forwardly the clutch sleeve is moved longitudinally outward and caused to engage with the inner wal-l of the driven .member for the pur se of driving it forward, and when the riving' member is turned backwardly the clutch sleeve is moved longitudinally inward a limited distance so it will positively engage with the brake drum expanding meansand by positive -rotatory pressure aga-inst said expanding means, .cause the expansion of the drum against the inner wall of the driven means for braking the same.

3. The combination of a wheel hub, a threaded sprocket hub, a 'threaded clutch sleeve fitt-ing and longitudinally movable along the sprocket hub, said sleeve having ratchet teeth in one end, a non-rotating brake drum located within the wheel hub, and rotatory means for expanding said brake drum against the inner surface of the wheel hub, said expanding means having ratchet teeth in one end, the threaded connection between the sprocket hub and the clutch sleeve being such that, when the sprocket 4hub is turned forwardly the clutch sleeve 1s moved longitudinally outward and caused to engage with the inner wall of the wheel hub for the purpose of driving' it forward, and

when the sprocket hub is turned backwardly y the clutch sleeve is moved longitudinally inward so its teeth will enga e with the'teeth of the brake drum expan ing means, and by positive rotatory pressure against said expanding means cause the expansion of the drum against the inner wall of the wheel hub for braking the same. 'i

4. The combination of a driven member, a threaded driving member, a threaded sleeve fitted upon and movable longitudiinward so that its teeth will nally along -the'driving member, said sleeve having ratchet teethin one end, a fixed expansible brake drum located in the driven member, outwardly moving wedges for expandin the brake drum, a rotatable cam shaft or *forcing the wedges outwardly,

and a rotatable collar connected with said cam shaft, said collar having ratchet teeth 1n `one face, the .threaded connection between the driving member and the threaded sleeve being such that, when the driving member 'is' turned forwardly the sleeve is moved longitudinally outward-finto engagement with the inner wall of the driven member, and w-henl the driving'member is moved lbackwardly the Vsleeve is moved longitudinally gage with the teeth on the co ar connected with the cam shaft.

5. The combination of a wheel hub having ball races in its ends, balls located in said races, cones holding said balls in the races, a'stationary axle extending through said cones, an expansible brake drum located within the wheel hub and held against rotation by one of the ball`cones, wed es located in opposite sides ofsaid drum or expanding the same, a cam shaft for forcing the wedges outwardly and. expandin the drum, atoothed collar attached to sai cam shaft, a sprocket wheel, a hub attached to said sprocket wheel, said hub having a thread on its exterior, and a sleeve with an interior thread fittin the threaded hub, said sleeve having one and adapted to engage-the inner wall of the wheel hub, and t e other end toothed for engagement with the toothed colla-r attached to the cam shaft, said threads being so arranged that forward movement of the sprocket hub moves the ositively enment ofthe sprocket hub causes the sleeve to x move longitudinally inward for the purpose of engaging its teeth with the teeth of `the cam shaft collar;

HARRY B. LESTER.

lfVitnesses:

JAS. DANGERFIELD, WILLIAM GRAY. 

